What are the signs that a car needs an oil change?

[StAshley]

When it's time to change the engine oil, the car's engine noise will increase. This is caused by the thinning of the engine oil. Additionally, the engine oil pressure warning light may illuminate, which is due to the low oil pressure resulting from the thinning of the engine oil. Below is some relevant information about car engine oil: 1. Engine oil, also known as engine lubricant (English name: Engine-oil), has a density of approximately 0.91*10³ (kg/m³). It serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leakage prevention, rust and corrosion protection, and shock absorption. It is often referred to as the "blood" of a car. 2. Engine oil consists of two main components: base oil and additives. The base oil is the primary component of the lubricant, determining its fundamental properties. Additives are used to compensate for and improve any deficiencies in the base oil's performance, as well as to provide certain new properties, making them an essential part of the lubricant.